我尝试复制一个涉及wfs请求的gwt-openlayers展示示例(此)。我保留了代码,然后将其修改为简单的复合材料,而不是一个抽象的示例,例如:
public class Example extends Composite {
public Example() {
buildPanel();
}
public void buildPanel() {
OpenLayers.setProxyHost("olproxy?targetURL=");
//create some MapOptions
MapOptions defaultMapOptions = new MapOptions();
defaultMapOptions.setNumZoomLevels(16);
MapWidget mapWidget = new MapWidget("500px", "500px", defaultMapOptions);
Map map = mapWidget.getMap();
WMSParams wmsParams = new WMSParams();
wmsParams.setFormat("image/png");
wmsParams.setLayers("topp:states");
wmsParams.setStyles("");
WMSOptions wmsLayerParams = new WMSOptions();
wmsLayerParams.setUntiled();
wmsLayerParams.setTransitionEffect(TransitionEffect.RESIZE);
String wmsUrl = "http://demo.opengeo.org/geoserver/wms";
WMS wmsLayer = new WMS("Basic WMS", wmsUrl, wmsParams, wmsLayerParams);
//Create a WFS layer
WFSProtocolOptions wfsProtocolOptions = new WFSProtocolOptions();
wfsProtocolOptions.setUrl("http://demo.opengeo.org/geoserver/wfs");
wfsProtocolOptions.setFeatureType("states");
wfsProtocolOptions.setFeatureNameSpace("http://www.openplans.org/topp");
//if your wms is in a different projection use wfsProtocolOptions.setSrsName(LAMBERT72);
WFSProtocol wfsProtocol = new WFSProtocol(wfsProtocolOptions);
VectorOptions vectorOptions = new VectorOptions();
vectorOptions.setProtocol(wfsProtocol);
vectorOptions.setStrategies(new Strategy[]{new BBoxStrategy()});
//if your wms is in a different projection use vectorOptions.setProjection(LAMBERT72);
final Vector wfsLayer = new Vector("wfsExample", vectorOptions);
wfsLayer.setFilter(new FeatureIdFilter(new String[]{"states.30"}));
//note that you can request the FID of a VectorFeature using getFID()
map.addLayer(wmsLayer);
map.addLayer(wfsLayer);
//Lets add some default controls to the map
map.addControl(new LayerSwitcher()); //+ sign in the upperright corner to display the layer switcher
map.addControl(new OverviewMap()); //+ sign in the lowerright to display the overviewmap
map.addControl(new ScaleLine()); //Display the scaleline
//Center and zoom to a location
map.setCenter(new LonLat(-100, 40), 4);
initWidget(mapWidget);
mapWidget.getElement().getFirstChildElement().getStyle().setZIndex(0); //force the map to fall behind popups
}
}
我部署了包含此面板的GWT应用程序,并在Internet Explorer 11中运行了它。11。使用开发人员工具,我检查了WFS XMLHTTPRequest,该WFS XMLHTTPRequest要求使用指定的ID提供该功能。XML请求如下:
<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd">
<wfs:Query typeName="feature:states" xmlns:NS1="" NS1:xmlns:feature="http://www.openplans.org/topp">
<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
<ogc:And>
<ogc:FeatureId fid="states.30" />
<ogc:BBOX>
<ogc:PropertyName>the_geom</ogc:PropertyName>
<gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326">
<gml:coordinates decimal="." cs="," ts=" ">-143.9453125,-3.9453125 -56.0546875,83.9453125</gml:coordinates>
</gml:Box>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
源自展示箱示例的相同请求是这样的:
<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd">
<wfs:Query typeName="feature:states" xmlns:feature="http://www.openplans.org/topp">
<ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
<ogc:And>
<ogc:FeatureId fid="states.30"/>
<ogc:BBOX>
<ogc:PropertyName>the_geom</ogc:PropertyName>
<gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326">
<gml:coordinates decimal="." cs="," ts=" ">-143.9453125,-3.9453125 -56.0546875,83.9453125</gml:coordinates>
</gml:Box>
</ogc:BBOX>
</ogc:And>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
它们是相同的,除了第2行上的这个位:... XMLNS:NS1 =" NS1 :XMLNS:feature = ...这是一个问题,因为它使我的请求无法通过GeoServer无法避免(它说 org.xml.sax.sax.saxparseexception:属性" prefix"的值" prefix =" xmlns",localPart =" ns1"NS1"无效。前缀的名称空间绑定可能不是空的)。对于不同种类的WFS特征过滤器(即逻辑),这似乎也发生了。而且,这仅在IE11上发生。在Firefox和Chrome上运行时,请求是正确构建的。我正在使用GWT 2.5.1和GWT-Openlayers 1.0。
我需要使它起作用,但是我找不到导致这种异常行为的是什么...
这似乎是IE11中的一个知识错误。
来源:http://osgeo-org.1560.x6.nabble.com/wfs-and-ie-11-td5090636.html
解决方法是覆盖openlayers.format.xml.write方法,其中一种删除了一些流氓文本(作者:stephen battey with krooole from Krooole):
var _class = OpenLayers.Format.XML;
var originalWriteFunction = _class.prototype.write;
var patchedWriteFunction = function() {
var child = originalWriteFunction.apply( this, arguments );
// NOTE: Remove the rogue namespaces as one block of text.
child = child.replace(new RegExp('xmlns:NS\d+="" NS\d+:', 'g'), '');
return child;
}
_class.prototype.write = patchedWriteFunction;
删除以下行时是否可以工作?
OpenLayers.setProxyHost("olproxy?targetURL=");